CN107404245B - Mixed type module multilevel converter submodule capacitor voltage fluctuates suppressing method - Google Patents
Mixed type module multilevel converter submodule capacitor voltage fluctuates suppressing method Download PDFInfo
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- CN107404245B CN107404245B CN201710574721.7A CN201710574721A CN107404245B CN 107404245 B CN107404245 B CN 107404245B CN 201710574721 A CN201710574721 A CN 201710574721A CN 107404245 B CN107404245 B CN 107404245B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of mixed type module multilevel converter submodule capacitor voltage fluctuation suppressing method.The fluctuation suppressing method generates the amplitude for needing to inject circulation reference value according to the absolute value of the modulation ratio of inverter, power factor and bridge arm reference voltage negative level part maximum value and the ratio of bridge arm maximum voltage.When inverter is run as rectifier, the phase of the injected circulation reference value of A, B, C three-phase is respectively 90 °, 210 ° and -30 °；When inverter is as invertor operation, the phase of the injected circulation reference value of A, B, C three-phase is respectively -90 °, 30 ° and -210 °.By closed-loop regulator, corresponding reference voltage is generated, the fluctuation of mixed type module multilevel converter submodule capacitor voltage is inhibited.
Description
Technical field
The present invention relates to a kind of suppressing methods of mixed type module multilevel converter submodule capacitor voltage fluctuation.
Background technique
Flexible high pressure direct current transportation (voltage sourced converter high based on voltage source converter
Voltage direct current, VSC-HVDC) technology obtains fast development due to higher flexibility and controllability.
Modularization multi-level converter (modular multilevel converter, MMC) is with its good harmonic characterisitic and Gao Ke
The development of flexible high pressure HVDC Transmission Technology is greatly promoted by property.
In overhead line direct current transportation field, traditional MMC being made of half-bridge submodule is when direct-current short circuit failure occurs
Do not have failure self-cleaning ability, application is very limited.Although the MMC being made of full-bridge submodule is in direct-current short circuit
Failure has failure self-cleaning ability when occurring, but therefore the cost of inverter and loss can also rise.The change of current in order to balance
The loss and cost of device, are provided simultaneously with direct-current short circuit failure self-cleaning ability, and pertinent literature is proposed by half-bridge submodule and full-bridge
It is as shown in Figure 1 to simplify circuit topology by the mixed type MMC that submodule is constituted.
Each bridge arm of MMC applied to flexible high pressure direct current transportation contains a large amount of cascade submodules, each submodule
Contain a capacitor.In MMC steady state operation, since charge and discharge electro ultrafiltration of the bridge arm current to sub- module capacitance makes institute
There is submodule capacitor voltage to be in fluctuation status, therefore, the value that the submodule capacitor of MMC need to reach certain is just able to satisfy its wave
The requirement of dynamic range, typical fluctuation range are no more than ± 10%.For example, Chinese yunnan power grid and south electric network major network ±
In 350kV/1000MW western Shandong back-to-back DC Asynchronous Interconnection engineering, since converter power is larger, Guangxi side converter valve is single
The quality of submodule has been more than 200kg, and Neutron module capacitor is 12mF, and quality has been more than 100kg, accounts for submodule quality
50% or so.Excessive submodule quality increases great difficulty to the implementation and debugging of engineering.
In order to solve this problem, pertinent literature and patent also proposed to fluctuate about MMC submodule capacitor voltage and inhibit
Method.In " Proceedings of the CSEE " the 7th 1892-1889 pages of the phase " modular multilevel unsteady flow published of volume 36 in 2016
Device module voltage Ripple Suppression strategy and application " propose it is a kind of using specific circulation inject come repressor module capacitance voltage wave
Dynamic method.But this method is primarily adapted for use in the semi-bridge type MMC that bridge arm reference voltage is positive always, does not consider that mixed type MMC is complete
Bridge submodule can export the operating condition of negative voltage, and this method can be such that the virtual value of bridge arm current dramatically increases, switching device
Current stress increase with it, increase the operation risk of inverter.
103001519 A of Chinese patent CN 103701350 A and CN proposes to inject in the reference voltage of MMC respectively high
The method that high-frequency current component is injected in frequency residual voltage and circulation, realizes submodule capacitor when MMC is run under low frequency condition
The fluctuation of voltage inhibits.This method does not consider that mixed type MMC full-bridge submodule can be defeated equally mainly for semi-bridge type MMC yet
The operating condition of negative voltage out, and injection high frequency residual voltage and high-frequency current will increase the switching frequency of switching device, certain
Increase the loss of MMC in degree.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, proposes a kind of mixed type module multilevel converter
Module capacitance voltage fluctuation suppressing method.The present invention is based on circulation method for implanting, and the more level of mixed type moduleization both may be implemented
The fluctuation of inverter submodule capacitor voltage inhibits, and will not dramatically increase bridge arm current virtual value.
Mixed type module multilevel converter submodule capacitor voltage proposed by the present invention fluctuation suppressing method include with
Lower step:
(1) amplitude for needing the circulation reference value injected is calculated；
The amplitude I of real-time measurement mixed type module multilevel converter AC phase currentsoj, according to having for inverter operation
Function power and reactive power calculate power-factor angleSine value, the expression formula for the circulation reference value amplitude injected is as follows:
Wherein, I2f_rBy injection circulation reference value amplitude, m is modulation ratio, and α is the more level changes of current of mixed type moduleization
The ratio for the maximum voltage that the absolute value and bridge arm of device bridge arm reference voltage negative level part maximum value can export, j is three-phase
Phase sequence, j=a, b, c, r are reference value.
(2) phase for needing the circulation reference value injected is generated；
When mixed type module multilevel converter is run as rectifier, when j=a, injected circulation reference value
Phase is 90 °；When j=b, the phase of injected circulation reference value is 210 °；When j=c, the phase of injected circulation reference value
It is -30 °；When mixed type module multilevel converter is as invertor operation, when j=a, the phase of injected circulation reference value
Position is -90 °；When j=b, the phase of injected circulation reference value is 30 °；When j=c, the phase of injected circulation reference value is-
210°。
(3) bridge arm current instantaneous value i on real-time measurement mixed type module multilevel converteruj, lower bridge arm electric current it is instantaneous
Value iljWith DC current instantaneous value Idc, the wink of three phase circulation of mixed type module multilevel converter is calculated using following formula
Duration icj:
When mixed type module multilevel converter is rectifier: icj=(iuj+ilj)/2+Idc/3；
When mixed type module multilevel converter is inverter: icj=(iuj+ilj)/2-Idc/3。
(4) by the circulation reference value that the needs that step (1) and step (2) obtain inject and the three-phase ring that step (3) obtain
The instantaneous value of stream makes the difference, and by closed-loop regulator, obtains mixed type module multilevel converter circulation voltage reference value ucj, benefit
Bridge arm reference voltage u on mixed type module multilevel converter is calculated separately with following formulapjWith lower bridge arm reference voltage unj:
Wherein, UdcFor DC voltage, uj_refIt is each phase exchange reference voltage.
(5) according to bridge arm reference voltage u on mixed type module multilevel converterpjWith lower bridge arm reference voltage unj, benefit
Modulator approach is approached with pulse duration modulation method or nearest level, bridge arm and all electronic power switch devices of lower bridge arm in generation
Signal is controlled, the electronic power switch device that signal controls upper bridge arm and lower bridge arm is controlled with this, realizes that mixed type module is more
The fluctuation of level converter submodule capacitor voltage inhibits.
Detailed description of the invention
Fig. 1 is mixed type module multilevel converter circuit topology；
Fig. 2 be mixed type module multilevel converter as rectifier when A phase circulation injection control block diagram；
Fig. 3 be mixed type module multilevel converter as inverter when A phase circulation injection control block diagram；
Fig. 4 is the submodule capacitor voltage ripple effect comparison diagram of one embodiment of the present of invention.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, being made of using mixed type module multilevel converter of the invention six bridge arms of three-phase, each
Bridge arm includes a bridge arm inductance, the full bridge power module FBSM of K series connection1..., FBSMK, K >=1, K are typically no less than N
55%, and the half-bridge module HBSM of (N-K) a series connectionK+1..., HBSMN, N >=K >=1.
Mixed type module multilevel converter submodule capacitor voltage of the present invention fluctuates suppressing method, works as mixed type module
When change multilevel converter is rectifier, control block diagram is as shown in Fig. 2, when mixed type module multilevel converter is inversion
When device, control block diagram is as shown in Figure 3, comprising the following steps:
(1) amplitude for needing the circulation reference value injected is calculated,
The amplitude I of real-time measurement mixed type module multilevel converter AC phase currentsoj, according to having for inverter operation
Function power and reactive power calculate power-factor angleSine value.The expression formula for the circulation reference value amplitude injected is as follows:
Wherein, I2f_rBy injection circulation reference value amplitude, m is modulation ratio, and α is the more level changes of current of mixed type moduleization
The ratio for the maximum voltage that the absolute value and bridge arm of device bridge arm reference voltage negative level part maximum value can export.J is three-phase
Phase sequence, j=a, b, c, r are reference value.
(2) phase for needing the circulation reference value injected is generated；
When mixed type module multilevel converter is run as rectifier, when j=a, injected circulation reference value
Phase is 90 °；When j=b, the phase of injected circulation reference value is 210 °；When j=c, the phase of injected circulation reference value
It is -30 °.When mixed type module multilevel converter is as invertor operation, when j=a, the phase of injected circulation reference value
Position is -90 °；When j=b, the phase of injected circulation reference value is 30 °；When j=c, the phase of injected circulation reference value is-
210°。
(3) bridge arm current instantaneous value i on real-time measurement mixed type module multilevel converteruj, lower bridge arm electric current it is instantaneous
Value iljWith DC current instantaneous value Idc, the wink of three phase circulation of mixed type module multilevel converter is calculated using following formula
Duration icj:
When mixed type module multilevel converter is rectifier: icj=(iuj+ilj)/2+Idc/3；
When mixed type module multilevel converter is inverter: icj=(iuj+ilj)/2-Idc/3。
(4) by the circulation reference value that the needs that step (1) and step (2) obtain inject and the three-phase ring that step (3) obtain
The instantaneous value of stream makes the difference, and by closed-loop regulator, obtains mixed type module multilevel converter circulation voltage reference value ucj, benefit
Bridge arm reference voltage u on mixed type module multilevel converter is calculated separately with following formulapjWith lower bridge arm reference voltage unj:
Wherein, UdcFor DC voltage, uj_refIt is each phase exchange reference voltage.
(5) according to bridge arm reference voltage u on mixed type module multilevel converterpjWith lower bridge arm reference voltage unj, benefit
Modulator approach is approached with pulse duration modulation method or nearest level, bridge arm and all electronic power switch devices of lower bridge arm in generation
Signal is controlled, the electronic power switch device that signal controls upper bridge arm and lower bridge arm is controlled with this, realizes that mixed type module is more
The fluctuation of level converter submodule capacitor voltage inhibits.
One embodiment of the present of invention is as follows:
In the present embodiment, the main circuit parameter of mixed type module multilevel converter is as shown in the table:
Suppression is fluctuated using mixed type module multilevel converter submodule capacitor voltage of the method for the present invention to embodiment
Steps are as follows for system:
(1) amplitude for needing the circulation reference value injected is calculated
The amplitude of real-time measurement mixed type module multilevel converter AC phase currents is 1491A, is transported according to inverter
Capable active power and reactive power calculates power-factor angleSine value be 0.287.Tune is calculated according to parameter in table
System is 0.9 than m, the ratio for the maximum voltage that the absolute value and bridge arm of bridge arm reference voltage negative level part maximum value can export
α is 0.155, and the expression formula of injected circulation reference value amplitude is as follows:
Wherein, I2f_rBy injection circulation reference value amplitude, j is three-phase phase-sequence, and j=a, b, c, r are reference value, according to
The amplitude that circulation reference value is calculated in above formula is 303A.
(2) phase for needing the circulation reference value injected is generated
When mixed type module multilevel converter is run as rectifier, when j=a, injected circulation reference value
Phase is 90 °；When j=b, the phase of injected circulation reference value is 210 °；When j=c, the phase of injected circulation reference value
It is -30 °.When mixed type module multilevel converter is as invertor operation, when j=a, the phase of injected circulation reference value
Position is -90 °；When j=b, the phase of injected circulation reference value is 30 °；When j=c, the phase of injected circulation reference value is-
210°。
(3) bridge arm current instantaneous value i on real-time measurement mixed type module multilevel converteruj, lower bridge arm electric current it is instantaneous
Value iljWith DC current instantaneous value Idc, the wink of three phase circulation of mixed type module multilevel converter is calculated using following formula
Duration icj:
When mixed type module multilevel converter is rectifier: icj=(iuj+ilj)/2+Idc/3；
When mixed type module multilevel converter is inverter: icj=(iuj+ilj)/2-Idc/3。
(4) by the circulation reference value that the needs that step (1) and step (2) obtain inject and the three-phase ring that step (3) obtain
The instantaneous value of stream makes the difference, and by closed-loop regulator, obtains mixed type module multilevel converter circulation voltage reference value ucj, benefit
Bridge arm reference voltage u on mixed type module multilevel converter is calculated separately with following formulapjWith lower bridge arm reference voltage unj:
Wherein, UdcFor DC voltage, uj_refIt is each phase exchange reference voltage.
(5) according to bridge arm reference voltage u on mixed type module multilevel converterpjWith lower bridge arm reference voltage unj, benefit
Modulator approach is approached with pulse duration modulation method or nearest level, bridge arm and all electronic power switch devices of lower bridge arm in generation
Signal is controlled, the electronic power switch device that signal controls upper bridge arm and lower bridge arm is controlled with this, realizes that mixed type module is more
The fluctuation of level converter submodule capacitor voltage inhibits.
Fig. 4 is the submodule capacitor voltage ripple effect comparison diagram of above-described embodiment.Fig. 4 a is that how electric mixed type moduleization is
Bridge arm half-bridge and full-bridge submodule capacitor voltage waveform in A phase when flat inverter does not use circulation method for implanting, by Fig. 4 a it is found that
The maximum value of submodule capacitor voltage is about 2150V, and Fig. 4 b is the upper and lower bridge arm current waveform of A phase, bridge under operating condition corresponding with Fig. 4 a
Arm current effective value is about 738A.Fig. 4 c is A Xiang Shangqiao when mixed type module multilevel converter uses circulation method for implanting
Arm half-bridge and full-bridge submodule capacitor voltage waveform, as seen from the figure, the maximum value of submodule capacitor voltage is about 2090V, is compared
Fig. 4 a, the maximum value of submodule capacitor voltage reduce about 60V, reduce about 40%.Fig. 4 d is A phase under operating condition corresponding with Fig. 4 c
Upper and lower bridge arm current waveform, bridge arm current virtual value is about 762A, and bridge arm current virtual value only increases about 3.3%.Significantly dropping
In the case where low submodule capacitor voltage fluctuation, bridge arm current virtual value increases unobvious.Therefore, submodule capacitor electricity of the present invention
Pressure fluctuation suppressing method can reduce the more level of mixed type moduleization in the case where not dramatically increasing bridge arm current virtual value and change
The fluctuation of device submodule capacitor voltage is flowed, in the case where meeting submodule capacitor voltage and fluctuating comparable situation, submodule electricity can be reduced
Hold, reduces inverter cost and volume.
Claims (1)
1. a kind of mixed type module multilevel converter submodule capacitor voltage fluctuates suppressing method, the mixed type module
Change multilevel converter to be made of six bridge arms of three-phase, every phase is made of upper and lower two bridge arms, and each bridge arm is by bridge arm inductance L
It is constituted with several cascade submodules, wherein the cascade existing half-bridge submodule of submodule has full-bridge submodule again, and feature exists
In: the fluctuation suppressing method comprises the steps of:
(1) amplitude for needing the circulation reference value injected is calculated；
The amplitude I of real-time measurement mixed type module multilevel converter AC phase currentsoj, according to the wattful power of inverter operation
Rate and reactive power calculate power-factor angleSine value；The expression formula of injected circulation reference value amplitude is as follows:
Wherein, I2f_rBy injection circulation reference value amplitude, m is modulation ratio, and α is mixed type module multilevel converter bridge
The ratio for the maximum voltage that the absolute value and bridge arm of arm reference voltage negative level part maximum value can export；J is three-phase phase-sequence,
J=a, b, c, subscript r are reference value；
(2) phase for needing the circulation reference value injected is generated；
When mixed type module multilevel converter is run as rectifier, when j=a, the phase of injected circulation reference value
It is 90 °；When j=b, the phase of injected circulation reference value is 210 °；When j=c, the phase of injected circulation reference value is-
30°；When mixed type module multilevel converter is as invertor operation, when j=a, the phase of injected circulation reference value
It is -90 °；When j=b, the phase of injected circulation reference value is 30 °；When j=c, the phase of injected circulation reference value is-
210°；
(3) bridge arm current instantaneous value i on real-time measurement mixed type module multilevel converteruj, lower bridge arm current instantaneous value ilj
With DC current instantaneous value Idc, the instantaneous value of three phase circulation of mixed type module multilevel converter is calculated using following formula
icj:
When mixed type module multilevel converter is rectifier: icj=(iuj+ilj)/2+Idc/3；
When mixed type module multilevel converter is inverter: icj=(iuj+ilj)/2-Idc/3；
(4) by circulation reference value that the needs that step (1) and step (2) obtain inject and three phase circulations that step (3) obtain
Instantaneous value makes the difference, and by closed-loop regulator, obtains mixed type module multilevel converter circulation voltage reference value ucj, under utilization
Formula calculates separately bridge arm reference voltage u on mixed type module multilevel converterpjWith lower bridge arm reference voltage unj:
Wherein, UdcFor DC voltage, uj_refIt is each phase exchange reference voltage；
(5) according to bridge arm reference voltage u on mixed type module multilevel converterpjWith lower bridge arm reference voltage unj, utilize arteries and veins
Wide modulator approach or nearest level approach modulator approach, the control of bridge arm and all electronic power switch devices of lower bridge arm in generation
Signal controls the electronic power switch device that signal controls upper bridge arm and lower bridge arm with this, realizes the more level of mixed type moduleization
The fluctuation of inverter submodule capacitor voltage inhibits.
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| CN108494261B (en) * | 2018-04-13 | 2019-12-10 | 东南大学 | active current limiting method suitable for direct current fault of MMC type direct current transformer |
| CN109510228B (en) * | 2018-10-24 | 2021-12-24 | 西安许继电力电子技术有限公司 | Zero direct current voltage control method and device for MMC |
| CN109245582A (en) * | 2018-10-24 | 2019-01-18 | 南方电网科学研究院有限责任公司 | The direct-current short circuit fault current sweep-out method of mixing module multilevel converter |
| KR102576611B1 (en) * | 2018-10-30 | 2023-09-11 | 한국전기연구원 | Voltage control device |
| CN110224622B (en) * | 2019-05-22 | 2020-10-30 | 中国科学院电工研究所 | Sub-module capacitor voltage fluctuation suppression method for full-bridge modular multilevel converter |
| CN112152248A (en) * | 2019-06-26 | 2020-12-29 | 中电普瑞电力工程有限公司 | Mixed MMC control method and system |
| CN110752764B (en) * | 2019-10-17 | 2021-02-09 | 南方电网科学研究院有限责任公司 | Flexible direct current control method and device |
| CN112701894B (en) * | 2021-01-26 | 2022-02-22 | 北京四方继保自动化股份有限公司 | Loop current injection MMC module voltage fluctuation suppression method considering bridge arm current |
| CN113224960B (en) * | 2021-04-28 | 2022-06-10 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Sub-module capacitor voltage fluctuation suppression method for full-bridge modular multilevel converter |
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